IMAP timing out in Apple Mail in Big Sur

I heard back from the makers of Little Snitch and together we figured out that Little Snitch and Avast do not play nicely together in Big Sur. I was able to restore my IMAP connections in all applications by completely uninstalling Avast and replacing it with Sophos (at least for the time being) since disabling the "Email Shield" in Avast had no effect. With this change made I can still use Little Snitch, have decent free AV and connect to all my SSL-enabled IMAP accounts.

I am having same issues on my MBP which I upgraded to Big Sur a few days ago. I am running the new version of Little Snitch on this machine, having upgraded from the older version.

I purchased a new Mac Mini M1 two days ago and I've installed the new version of Little Snitch and AVG Anti Virus and the email app is working perfectly.

I have to wonder because it was a clean install on the Mini there isn't any "stuff" left over from the old version of Little Snitch. The alternate could be that Big Sur works better on the M1 chip.

At this point I'm not prepared to do a clean install on my MBP - will wait to see the the subject matter experts say.

I finally got my resolved yesterday with an Applecare advisor. Basically we went in, deleted the SMTP out server and then added it back in making sure that SSL was checked and that it was NOT "automatically managed". You'll need to know what port numbers to use for Hotmail. For GoDaddy the combo that worked for OUTGOING was:

Port: 465

Uncheck Automatically manage connection settings

Check Use TLS/SSL

Authentication: Password

Hope this helps.

Hi All,

have the same issue on my MacBook 12". Big Sure latest. AVG Internet Security.

Tried everything you suggested.

Finally I totally deleted AVG, but nothing has changed.

Don't know what to do, because it still does not work...getting fed up with this.

Someone has suggested they installed AVAST virus scanner to correct Gmail's Problem with Big Sur OS. You should never install any kind of Anti Virus software on an iMac. The user may think they have uninstalled it but chances are, they haven't completely.

After uninstall AVG totally, after turn off built-in firewall (which was irrelevant so I turned again on), after I moved all my IMAP folders from icloud to an other supplier now it seems like it works.

But there is a BUT: not all the IMAP folders are synchronized so I can now just laugh. There was no problem before big sur, and after installing it I have to try almost one week? Really? Pfffff.

I have found this solution from another one (a User had a problem with Sierra):

Its working for the Problem with Smtp Mail and BIG SURE!

I don't know if this solution affects the network security in a way...and it's working only with one type of internet connection. But now i can send my mails again from my macbook like on my iphone and ipad! What do you think about?

---------------------------------------------------------

Ok, try these to start with...

Make a New Location, Using network locations in Mac OS X ...

http://support.apple.com/kb/HT2712


System Preferences>Network, top of window>Locations>Edit Locations, little plus icon, give it a name.

System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.

The interface that connects to the Internet should be dragged to the top of the list.


If using Wifi, instead of joining your Network from the list, click the WiFi icon at the top, and click join other network. Fill in everything as needed.

System Preferences>Network>choose interface>Advanced>Proxies Tab, make sure none are set, like for HTTP & HTTPS.

System Preferences>Network, unlock the lock if need be, highlight the Interface you use to connect to Internet, click on the advanced button, click on the DNS tab, click on the little plus icon, then add these numbers...

8.8.8.8

8.8.4.4

1.1.1.1

9.9.9.9

Apply.

Posted on Nov 5, 2019 12:30 PM

I lost all my bellsouth.net mail after the upgrade to macOS Big Sur & the patch macOS Big Sur 11.1

As I have Microsoft Office Business Account Paid since it came out. My Outlook Business Mail works, Gmail, iCloud. I called Apple, Microsoft & AT&T.

All my emails worked until the upgrade to macOS Big Sur 11.0.1.

Microsoft Office Business: This is what works!

Excel

Word

Publisher

OneNote

Outlook just sits spins & the dumb message Not Responding.

I still cannot add my bellsouth.net email account. Same error Settings or Password.

This was my backup email since 1999.

All Contacts & emails are gone. Not in iCloud or my Verizon Backup for my 2 iPhones

Brand new MacBook Pro 16” top of the line and 2 new iPhones: iPhone 12 Mini & iPhone 12 Pro Max. It is extremely difficult to understand that Apple is aware and has done nothing to fix the issue. I have been given imap & pop incoming - outgoing smtp settings from AT&T, Apple & Microsoft. And everyone has something different. I still have screenshots from all my Apple devices & have everything written down from the day I said goodbye to Android & Windows to Mac. Now I feel like I am back with Windows. I f there is a wonderful person that can help it would be a beautiful thing.

Stressed by far. Happy Holidays.

I have the same issue, Apple Mail and Godaddy Exchange emails are not coming through but they work with Microsoft Outlook and other mail portals. Very frustrating, need a fix.

Slight correction: I meant disabling the Email Shield (vs. Web Shield) of course in the above-mentioned reply. Apologies.

Hi. If you're running AVG AntiVirus, disabling web and email protection fixed the time out problem for me.

Hi. If you're running AVG AntiVirus, disabling web and email protection fixed the IMAP and POP time out problem for me.

Try downloading and running malwarebytes.com software. It is free. As recommended by “old Toad” on this forum, it worked for me. iMac 2017 now with Big Sur.

Try malwarebytes.com. Free download. Have MacKeeper and it removed something from it, and fixed SOCKS proxy. Big Sur is now running fine. iMac 2017.